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sql sElECt sum

"当然不是能用where

如果要 三列 A B C c列是 A+B的和 那么select sum(a) as A列,sum(b) as B 列,sum(a)+sum(b) as C列 from tablea 如果要 单列 ab的和 只需select sum(a)+sum(b) as 总和 from tablea 如果想要涉及变量 那就declare @sum int select @sum = sum(a)...

首先确认一点,你问是sum()函数; sum函数是求和的意思; sum函数的格式:SELECT SUM(column_name) FROM table_name sum函数的参数是数字类型

sql 中的 sum 配合 case when 就可以添加条件 例 : sum(case when a >0 then a else 0 end ) 将 a列所以大于 0 的值相加。 sum(case when rq >'2015-1-1' and rq

--sql2008+,行列转换的查询方式select * from 表pivot( sum(a) for b in(北京,河南,山东))--任意版本select sum(case when b='北京' then a else 0 end) as 北京,sum(case when b='河南' then a else 0 end) as 河南,sum(case when b='山东' the...

sql语句distinct是去掉完全重读的两行记录。 sum是求和汇总的,加上分类写法如下: TEACHER表中查询年龄大于40岁的教师的工资总数。实例代码: SELECT distinct SUM(SAL) AS OLDSAL FROM TEACHER WHERE AGE>=40

select ksmc,sum(days)as days from 表group by ksmc

可以用数字取: resultSet.getInt(1) ; 或者给个别名:select sum(count) as ss,id from aa 然后 resultSet.getInt(ss)

你是要按月分和销售人员来对销售额透视,而sql语句只对月份分组,正确结果应该增加分组维度 select月份,sum (case when 销售人员='姓名1' then 销售数量*产品单价 else 0 end) as 姓名1销售额,sum (case when 销售人员='姓名2' then 销售数量*产...

是这个意思吗? SUM(CASE WHEN W.TypeID = 999 AND (SUM(CASE WHEN W.TypeID = 999 AND BDate='2014-04-02' THEN BValue ELSE 0 end) as EndingBalance)='2014-04-02' THEN BValue ELSE 0 end) as EndingBalance请详细描述一下需求

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